Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia.
Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia.
Int J Mol Sci. 2020 May 22;21(10):3668. doi: 10.3390/ijms21103668.
In this research, antimicrobial polysaccharide chitosan and natural extracts were used as surface coating of a plastic laminate with an integrated whey layer on the inside. The aim was to establish the biodegradable and active concept of packaging laminates. For this purpose, chitosan nanoparticles (CSNPs) with embedded rosemary or cinnamon extracts were synthesised and characterised. Additionally, a whey-based laminate was functionalised i) chitosan macromolecular solution was applied as first layer and ii) cinnamon or rosemary extracts encapsulated in CSNPs were applied as upper layer (layer wise deposition). Such functionalised whey-based laminate was physicochemically characterized in terms of elemental surface composition, wettability, morphology and oxygen permeability. The antimicrobial activity was tested against and . The antioxidant properties were determined using the ABTS assay. It could be shown that after functionalization of the films with the above-mentioned strategy, the wettability was improved. Furthermore, such whey-based laminates still show excellent barrier properties, good antimicrobial activity and a remarkable antioxidative activity. In addition to the improved biodegradability, this type of lamination could also have a positive effect on the shelf-life of products packaged in such structured films.
在这项研究中，抗菌多糖壳聚糖和天然提取物被用作具有内部乳清层的塑料层压板的表面涂层。目的是建立可生物降解和活性包装层压板的概念。为此，合成并表征了嵌入迷迭香或肉桂提取物的壳聚糖纳米颗粒 (CSNP)。此外，还对基于乳清的层压板进行了功能化：i）将壳聚糖大分子溶液作为第一层施加，ii）将包封在 CSNP 中的肉桂或迷迭香提取物作为上层施加（分层沉积）。根据元素表面组成、润湿性、形态和氧气渗透性对这种功能化的基于乳清的层压板进行了物理化学表征。测试了其对 和 的抗菌活性。使用 ABTS 测定法测定了抗氧化性能。结果表明，通过上述策略对薄膜进行功能化后，润湿性得到了改善。此外，这种基于乳清的层压板仍然具有出色的阻隔性能、良好的抗菌活性和显著的抗氧化活性。除了提高生物降解性外，这种层压结构还可能对包装在这种结构薄膜中的产品的保质期产生积极影响。
